CPC B23B 27/148 (2013.01) [C23C 16/36 (2013.01); C23C 16/45576 (2013.01); C23C 16/56 (2013.01); B23B 2228/105 (2013.01)] | 9 Claims |
1. A cutting tool comprising a substrate and a coating film disposed on the substrate, wherein
the coating film comprises a first layer formed from a plurality of hard grains,
the hard grains are made of TiSiCN having a cubic crystal structure,
the hard grains have a lamellar structure in which a layer having a first silicon concentration and a layer having a second silicon concentration, lower than the first silicon concentration, are alternately stacked,
the first silicon concentration corresponds to a number ASi of silicon atoms divided by a sum of a) a number ASi of silicon atoms and b) a number ATi of titanium atoms in a grain boundary region between the hard grains, {ASi/(ASi+ATi)},
the second silicon concentration corresponds to a number BSi of silicon atoms divided by a sum of c) a number BSi of silicon atoms and d) a number BTi of titanium atoms in the first layer, {BSi/(BSi+BTi)}, and
a maximum value of ASi/(ASi+ATi) is greater than an average value of BSi/(BSi+BTi).
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